http://www.cryptoalts.com - supports scrypt, x11, and sha256 mining.
The XC specific page is a bit ugly with the CSS right now, and I'll have to also update the generic CSS to add some x11coin in it, but I'll get around to getting that updating that later today to make it match the x11coin theme.
Donations appreciated : XHdCzYnsHTgHJ9igqykNjbccEGxPp4DUch
Will be a bit of a beta for about one day, but like with other coins, you will be able to mine XC only, or spread your hash among other coins available (BC, MINT, SHARE) if you like via the "hybrid mining" feature this pool supports.
Please report any bugs/issues in #cryptoalts freenode, so that anything bugged max be patched asap.
Mine with your wallet addresses, and set password to anything, like x.
If you want XC only, your username in your conf is your XC wallet address
for example : "-o stratum+tcp://useast1.cryptoalts.com:5555 -u XJqgm3YCr6HgC7JY82bu4beyTZ17ZegN4B -p x"
If you want something like BC and XC at the same time, your username is bcaddress.xcaddress (more detailed explanation here http://cryptoalts.com/hybrid/)
Anyway, I already have a miner on it testing in advance : http://cryptoalts.com/stats/?miner=XJqgm3YCr6HgC7JY82bu4beyTZ17ZegN4B
Page is ugly right now, but I will update the CSS so it looks like :
http://cryptoalts.com/stats/?miner=B4ye3oE2RTHPJY5DSRT4uPMEAwkLyDG34u (BC)
http://cryptoalts.com/stats/?miner=MpCfV8zDAZy4wJmjZJpMS4JL34tNFqtaVn (MINT)
http://cryptoalts.com/stats/?miner=Sh6P8bF43ap4LmpeZnYEFaKNbqrRQBaUNt (SHARE)
Just with the x11coin color theme.